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No. 6l5,265. Patented Dec; 6, I898. 8. Z. DE FERRANTI.

ALTERNATING CURRENT DYNAMO ELECTRIC MACHINE.

(Application filed'Dec. 28 1897.)

(No man.) 4 Sheets-Sheet l yg fiuznzor I a g mg fierzywm fli y No. 65,265. Patented Dec. 6, I898. 8. Z. DE FERRANTI. ALTERNATING CURRENT DYNAMU ELECTRIC MACHINE.

(Application filed Dec. 28, 1897,)

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No. 65,265. I Patented Dec. 6, I898. s. 2. DE FEBRANT-l.

ALTERNATING CURRENT DYNAIM] ELECTRIC MACHINE.

(Application filed Dec. 28, 1897.) (No Model.) 4 Sheets-Sheet 3.

a f Q J g F"""" I ll No. 6|5,265. Patented Dec. 6, I898. 8. 2. DE FERRANTI.

ALTERNATING CURRENT DYNAMO ELECTRIC MACHINE.

(Application filed Dec. 28, 1897.)

(No Model.) 4- Sheets-Sheat 4.

Jz w 22;. z W'inwms JZVZor M W 12M??? ETERS co. Pnoroumo. wasumsmu n c UNITED STATES PATENT OFFICE.

SEBASTIAN ZIANI DE FERRANTI, OF HOLLINXVOOD, ENGLAND.

ALTERNATlNG-CURRENT DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent N 0. 615,26 5, dated December 6, 1898.

A Application filed December 28, 1897. Serial No. 664,001. (No model.)

To all whom, it may concern.-

Be it known that I, SEBASTIAN ZIANI DE FERRANTI, electrical engineer, a subject of the Queen of Great Britain, residing at Hollinwood, in the county of Lancaster, England, have invented a new and useful Improvement in Alternating-Current D ynamo-Electric Machines, (for which I have obtained a patent in Great Britain, No. 4,490, dated March 2, 1895,) of which the following is aspecification.

This invention relates to improvements in alternating current dynamo electric machines provided with disk armatures constructed of a series of fiat bobbins without V be maintained flat.

iron cores. It is applicable both to machines in which the armature is fixed and also to those in which the armature is rotary, the field-magnet being fixed.

According to my invention I make up the armature-bobbins in pairs, with a non-magnetic metal holder on each side, said holder being insulated from the bobbins with a sufficient thickness of insulation to withstand the electromotive force'generated by the pair of bobbins. The metal holders are pressed together with the bobbins between under very considerable pressure and are then riveted or screwed together tightly under this pressure. Between said holders I provide terminal blocks for connecting the end of the conductor in one pair of bobbins to the end of the conductor in the next pair, and I may further provide registering-pins which cause one pair of bobbin-holders to register accurately With the adjacent pair, so that the disk may The bobbin-holders are mounted upon supports which are insulated from the main framework of the armature, so that the insulation between the bobbins and holders is not required to withstand the electromotive force generated by the machine, but only that due to a single pair of bobbins.

It is a further object of my invention to arrange that the bobbins shall be-capable of adj ustment radially after the machine has been worked.

My invention therefore consists in the constructional details by which I achieve the objects above set forth, and in order that the same may be clearly understood I shall proceed to describe it with reference to the accompanying drawings, in which- Figure 1 is an elevation, partly sectional, of a portion of a rotary armature constructed according to my invention, together with a portion of the field-magnet. Fig. 2 is a sectional view, the left-hand portion being taken on the line A B, Fig. 1, and the right-hand portion on the line C D, Fig. 1. Figs. 3 and 4 are elevations at right angles to each other, illustrating a single armature-coil supported and constructed according to my invention. Fig. 5 is an elevation, partly sectional, and Fig. 6 is an elevation, also partly sectional, at right angles to Fig. 5, illustrating my invention applied to stationary armatures. Figs. 7, 8, 9, and 10 are similar views, respectively, Fig. 7 having the armature-bobbins removed.

Like letters of reference denote the same parts throughout the drawings.

a is the main frame of the armature.

Z) are the armaturebobbins, and c metallic plates forming the holders between which the armature-bobbins are tightly clamped, said plates being tightly pressed together and then firmly secured by the rivets or screws 0.

(1 indicates the insulation between the arm ature-bobbins and their holders.

The field-magnet is indicated at e in Figs. 1, 2, 7, 8, and 10, the poles being shown at e in the same figures and also in Fig. 6.

Referring now to Figs. 1 to 1, the holders 0 are provided with lugs 0 which are attached by means of supporting-bolts f to the main portion of the armature a. Said supportingbolts are in Figs. 1 and 2 shown screwed into nuts f in recesses g in the main framework of the armature, said recesses being filled with sulfur compound or other suitable insulating cement, so that the nuts are insulated and at the same time held rigidlyin position. The bolts f are covered with an insulatingtube f of ebonite, mica, porcelain, or any other suitable insulator, and the nuts f may also be covered with insulation, as shown at the left hand of Fig. 2.

The cores of the bobbins are constructed of non-magnetic metal strips or laminae b',which may be insulated from each other by strips of asbestos paper or other insulating material. Said cores may be in electrical contact with the bobbin-holders c. The windings of the bobbins Z) are made of metallic strips.

In the construction shown in Figs. 3 and 4c the bolts f are screwed direct into the armature-framework, being provided with a tube and washer f to insulate them from their respective lugs 0 In Figs. 9 and 10 the bobbins are supported in a similar manner to that shown in Figs. 3 and 4. The armature, however, in this case is fixed, the field-magnet e, the poles of which are seen at 6, being rotary.

By using radial bolts, as shown, to support the armature-bobbins from the frame I obtain an important advantage, since when the armature-bobbins are first put into the machine and before the spring has been taken out of them by ordinary running they need not be drawn home into position, the tightening being readily effected at any subsequent time by means of the radial bolts to the extent required, so that all the armaturebobbins are wedged tightly together. In the construction shown in Figs. 1 and 2 this radial adjustment is effected by screwing up the nuts f The drawings show the nuts in their limiting position, when no further tightening of the bobbins can be effected.

In the construction shown in Figs. 5 to 8 the holders 0 are secured by means of the bolts h to pieces j, fixed in recesses g in the framework a by means of a sulfur or insulating compound. Provision is made for preventing surface leakage along part j by extending the insulation by means of an ebonite or other insulating ringj, interposed between said part j and the orifice where it enters the casting a. In these cases the radial movement of a bobbin or pair of bobbins, when necessary, is effected by means of the bolts 70, passing through lugs 0 secured to the holder 0. The orifices h in the holders 0, through which the bolts 7L pass, are elongated, so that the bobbins, with their holders, can move radially with reference to the bolts. Furthermore, the inner or free ends of the bobbins are also preferably clamped in pairs between non-magnetic holders Z, and I provide for causing the successive pairs of bobbins to register and secure the true alinement of the same by means of a slide or pin Z, placed between the clamping-plates of adjacent pairs of bobbins. This is clearly shown in Fig. 5. Similar registering-pins may of course be provided at the other ends of the bobbins, but will not in general be necessary.

I preferably arrange that the non-magnetic clamping-plates a shall act as carriers of the current from one bobbin to the other one in the pair, the inner ends of the windings being connected to the metallic cores of their respective bobbins, with which cores the clamping-plates make electrical contact. The outer ends of the winding are connected to metal blocks m, clamped between the plates 0 by means of insulating-rivets m, and said blocks are provided with terminal projections m which can be connected to a similar block on the next pair of bobbins by means of a strap bination of bobbins constructed of metal strips composing the armature,laminated metallic cores for said bobbins, pairs of metal plates separated by said bobbins and between which said bobbins are clamped and means for supporting and insulating said metal plates from the main framework of the armature, as set forth.

2. In an alternating-current dynamo-electric machine having a disk armature,the combination of bobbins constructed of metal strips composing the armature, laminated metallic cores for said bobbins, pairs of metal plates separated by said bobbins and between which said bobbins are clamped and which make electrical connections with the metallic cores thereof, and means for supporting and insulatin g said metal plates from the main framework of the armature, as set forth.

3. In an alternating-current dynamo-electric machine having a disk armature,the combination of bobbins constructed of metal strips composing the armature,metallic cores formed of insulated laminze for said bobbins, pairs of metal plates separated by said bobbins and between which said bobbins are clamped, and means for supporting and insulating said metal plates upon the main framework of the armature, as set forth.

4. In an alternating-current dynamo-electric machine having a disk armature,the combination of bobbins constructed of metal strips composing the armature, laminated metallic cores for said bobbins to which cores the inner end of each metal strip is electrically connected, pairs of metal plates separated by said bobbins and between which said bobbins are clamped, means for connecting said plates with the metallic cores of the bobbins, pieces of insulating material interposed between each of said metal plates and the metal strips forming the conductors of the bobbins, and means for supporting and insulating said metal plates from the main framework of the armature, as set forth.

5. In an alternating-current dynamo-electric machine havinga disk armature,the combination with the bobbins composing the armature, of pairs of metal plates separated by said bobbins and between which said bobbins are clamped, pieces of insulating material interposed between each of said metal plates and the bobbins, and means for supporting and insulating said metal plates from the main framework of the armature, as set forth.

6. In an alternating-current dynamoelectric machine having a disk armature,the combination with the bobbins composing the armature, of metal plates between which said bobbins are clamped in pairs,said metal plates forming an electrical connection between the inner ends of the conductors from each pair of bobbinsjns ulated terminal blocks also held between said plates to which blocks the outer ends of the conductors of the bobbins are con nected, and means for supporting and insulatin g said metal plates from the main fram ework of the armature, as set forth.

7. In an alternating-current dynamo-electric machine having a disk armature,the combination with the bobbins composing the armature, of pairs of metalplates separated by said bobbins and between which said bobbins are clamped, pieces of insulating material interposed between each of said metal plates and the bobbins, and insulated bolts securing said metal plates to the main framework of the armature, as set forth.

8. In an alternating-current dynamo-electric machine having a disk armature, the combination with the bobbins composing the armature, of separately-insulated supports for said bobbins, and means for adjusting the armature radially and compressing the sections after the machine has been in use, as set forth.

9. In an alternating-current dynamo-electric machine havinga disk armature, the combination with the bobbins composing the armature, of metal plates between which said bobbins are clamped, insulated bolts securin g said metal plates to the framework of the armature, and means for adjusting the armature radially and compressing the sections after the machine has been in use, as set forth.

10. In an alternating-current dynamo-electric machine having a disk armature the combination with the bobbins composing the armature, of metal plates between which said bobbins are clamped, pieces of insulating material interposed between each of said metal plates and the bobbins, and radial insulating-bolts for supporting said metal plates and adjusting the distance of the bobbins from the main framework of the armature, as set forth.

11. In an alternating-current dynamo-electric machine having a disk armature,the combination with the bobbins composing the armature, of metal plates between which said bobbins are clamped, pieces of insulating material interposed between each of said metal plates and the bobbins, and bolts held by but insulated from the main framework of the armature for securing said metal plates I thereto as set'forth.

12. In an alternating-current dynamo-electric machine having a disk armature,the combination with the bobbins composing the armature of metal plates between which said bobbins are clamped, bolts having insulated coverings for supporting said metal plates, and nuts held in cavities in the main framework of the armature by means of an insulating compound into which nuts said bolts are screwed, as set forth.

13. In an alternating-current dynamo-electric machine having a disk armature,the combination with the bobbins composing the armature, of metal plates between which said bobbins are clamped, bolts having insulatingcoverings for supporting said metal plates, and nuts covered with an insulating compound and held in cavities in the armatureframework by means of an insulating compound into which nuts the supporting-bolts are screwed, as set forth.

14. In an alternating-current dynamo-electric machine having a disk armature,the combination with the bobbins composing the armature, of metal plates between which said bobbins are clamped, bolts having insulatingcoverings for supporting said metal plates, nuts held in cavities in the main framework of the armature by means of an insulating compound, and porcelain sleeves surrounding said bolts at the places where they pass into the cavities in the framework of the armature, as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subseribin g witnesses.

SEBASTIAN ZIANl DE FERRANTL W itn esses:

WILMER MATTHEWS HARRIS, FREDERICK OowLEY HARRIS. 

